Remove tabs from build/all.gyp and replace with spaces

My previous checking mistakenly used tabs. replacing
them with spaces as required by the style guide.
https://codereview.chromium.org/545103003/

Review URL: https://codereview.chromium.org/570933004

Cr-Commit-Position: refs/heads/master@{#295122}

build/all.gyp

@@ -1144,7 +1144,7 @@
               'dependencies': [
                 '../base/base.gyp:base_unittests',
                 '../chrome/chrome.gyp:browser_tests',
-		'../chrome/chrome.gyp:sync_integration_tests', 
+                '../chrome/chrome.gyp:sync_integration_tests', 
                 '../chrome/chrome.gyp:crash_service',
                 '../chrome/chrome.gyp:gcapi_dll',
                 '../chrome/chrome.gyp:pack_policy_templates',